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Questions and Answers
What happens when you assign a value from a larger integer type to a smaller integer type?
What happens when you assign a value from a larger integer type to a smaller integer type?
- The compiler generates an error
- The value is automatically converted to the larger type
- The value is truncated to fit the smaller type (correct)
- The value is rounded to the nearest value that fits the smaller type
Which of the following is a valid way to initialize a character variable in C?
Which of the following is a valid way to initialize a character variable in C?
- char c = 'a';
- char c = "a";
- char c = 97;
- All of the above (correct)
If you have a short int variable and an int variable, what happens when you perform an arithmetic operation on them?
If you have a short int variable and an int variable, what happens when you perform an arithmetic operation on them?
- The int is automatically demoted to short int before the operation
- The result depends on the specific values of the variables
- The short int is automatically promoted to int before the operation (correct)
- The compiler generates an error
What is the output of the following code? char c = 65; printf("%d", c);
What is the output of the following code? char c = 65; printf("%d", c);
Which of the following is a valid way to declare multiple variables of the same type in a single statement?
Which of the following is a valid way to declare multiple variables of the same type in a single statement?
What is the range of values that can be stored in a short int variable?
What is the range of values that can be stored in a short int variable?
What is the output of the following code? int x = 65; char c = x; printf("%c", c);
What is the output of the following code? int x = 65; char c = x; printf("%c", c);
Which of the following is a valid way to declare a variable name in C?
Which of the following is a valid way to declare a variable name in C?
What happens when you assign a value from a floating-point type to an integer type?
What happens when you assign a value from a floating-point type to an integer type?
Which of the following is a valid way to declare and initialize a character variable in C?
Which of the following is a valid way to declare and initialize a character variable in C?
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Study Notes
Converting Unsigned Char to Int
- The unsigned char
11001101is converted to0000000011001101in int form.
Converting Int to Char/Short
- When a char or short int is assigned an int value, it is converted back to its original size by removing surplus bits on the left.
Converting Signed/Unsigned Values
- When a signed value is converted to an int, the left bits are filled with 1s if the leftmost bit is set, preserving negative values.
- When an unsigned value is converted to an int, the left bits are filled with 0s.
Mixing Variable Types in Expressions
- C allows mixtures of variable types in expressions, following these rules:
- Char or short variables are converted to int.
- If any variables are long, all char, short, and int variables are converted to long.
- If any variables are unsigned, all signed variables are converted to unsigned.
Weakly Typed Language
- C is a weakly typed language, allowing variables and constants of differing types to be mixed in expressions or assignments without explicit conversion functions.
- Automatic conversions take place between character, integer, and floating-point values.
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